H2-공기와 CO-공기 예혼합화염 사이의 후류상호작용에 있어서 CO2 첨가 효과
Effects of CO2 Addition in Downstream Interaction between H2-Air and CO-Air Premixed Flames
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Numerical study was conducted to clarify effects of added CO2 for the downstream interaction between H2-air and CO-air premixed flames in counterflow configuration. The reaction mechanism adopted was Davis model which had been known to be well in agreement with reliable experimental data. The results showed that both lean and rich flammable limits were reduced. The most discernible difference between the two with and without having CO2 addition into H2-air and CO-air premixtures was two flammable islands for the former and one island for the latter at high strain flame conditions. Even a small amount of H2, in which H2-air premixed flame cannot be sustained by itself, participates in CO oxidation, thereby altering the CO-oxidation reaction path from the main reaction route with a very long chemical time in CO-air flame to the (H, O, OH)-related reaction routes including with relatively short chemical times. This intrinsic nature alters flame stability maps appreciably. The results also showed that chemical effects of added CO2 suppressed flame stabilization. Particularly this phenomenon was appreciable at flame conditions which lean and rich extinction boundary was merged. The detailed discussion of chemical effects of added CO2 was addressed to the present downstream interaction.
Abstract
Numerical study was conducted to clarify effects of added CO2 for the downstream interaction between H2-air and CO-air premixed flames in counterflow configuration. The reaction mechanism adopted was Davis model which had been known to be well in agreement with reliable experimental data. The results showed that both lean and rich flammable limits were reduced. The most discernible difference between the two with and without having CO2 addition into H2-air and CO-air premixtures was two flammable islands for the former and one island for the latter at high strain flame conditions. Even a small amount of H2, in which H2-air premixed flame cannot be sustained by itself, participates in CO oxidation, thereby altering the CO-oxidation reaction path from the main reaction route with a very long chemical time in CO-air flame to the (H, O, OH)-related reaction routes including with relatively short chemical times. This intrinsic nature alters flame stability maps appreciably. The results also showed that chemical effects of added CO2 suppressed flame stabilization. Particularly this phenomenon was appreciable at flame conditions which lean and rich extinction boundary was merged. The detailed discussion of chemical effects of added CO2 was addressed to the present downstream interaction.
참고문헌 (27)
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